Combination relief and back-pressure valve.



W.. HGHFELDT. UUMMNATON RENE? AND BACK PRESSURE VALVE APPL-NATION FLED DE02?, 1904.

lldrvrren @trarne Patented JulyV 4i, 1905.

terreur Ottime.

"lllflLLlAt/l HOCHYFELDT, OF CldlCAGO, llQLlNOlEWB, ASSlGNOlt OF ONE-HALF TO GEORGE F. HUGHSON, OF CHICAGO, lLLlNOl.

SPECIFICI-1.111012' forming part of Letters Patent No. 793,788, dated Application tiled December 27, 1904. Serial No. 238,550.

lie it known that l, "WILLIAM l locnmng'n'r, a citizen ot' the United States, residing at Chicago, in the county ot' Cook and State ot Illinois, have invented certain new and useful lnuin'ovements in a Combination Relief and Back-Pressure Valve, ot' which the `Following is a speciiica-tion.

'.lhe object o1 my invention is the production ot' an improved valve which with slight change may be used as a relief or back-pressure valve either for condensing or for non-comlemsingl engines. l

Aln the accompanying drawings, Figure 1 is a vertical central section taken through a horizontal valve embodying the features ot my invention. Fig. 2 is a similar view of a vertical valve embodying my invention.

.Referring to Fig. 1, the valvecasii'1g 1 has the usual inlet 2 and outlet 3 and a partition d extending across the interior ol said casing. ln an opening1 5 in said partition is cured in any suitable manner, as by means ot a screw-thread connection, a ring G, providing a valveseat 7. ,A rim oi'iiange 8, extending partly around said valve-seat, is adapted, in conjunction with the vertical portion ot the partition et, to retain a quantity ot water around the valve, to be hereinafter described,

tor forming a water seal. Aln the upper and lower sides oi the valverasingg,1 1 are formed openings 9 and 10. The opening 9 lis closed by a top cap 11, secured tothe casing in any suitable manner, said top cap comprising a dash-pot cylinder 12. A pipe 13, extendingl through said top cap to a point above the valve-seat 7, provides means tor admitting water to Alorm a water seal. The opening 10 in the lower side ot the valve-casing 1 is closed by a bottom plate 141-, suitably secured to the casing. Upon the upper side ol the bottom plate is `formed a cylinder 15, alined with the cylinder 12 and the valve-seat 7. A port 16 is formed in the bottom plate 1e, and the valve-casing 1 connects the cylinder 15 with the atmosphere. Communication between said cylinder and theatmosphere is controlled by a valve 17, lyingI within a suitable stuiiingbon and arranged to be seated upon a valve- A d rip-pipe 19 carries oli.'

seat 18 in said port.

July 1, 1905.

the excess ol water Vfrom the water seal, which otherwise might lind its way into the cylinder 15. Upon a valve-stern 2() is rigidly secured in any coi'ivenient manner a piston 21 Vlor the cylinder 12, a valve 22 t'or the valve-seat 7, and a piston 23 Vt'or the cylinder 15, said piston 28 fitting its cylinder loosely in order to permit i'luid to leak past said piston. A sottmetal 'Facing-ring 2e is provided for the valve 22 to reduce wear upon the valve-seat 7. '.lhc Lipper end ot' the valve-stem 2O is connected, by means oi" a link 25, with an arm 2G, lixed upon a sha1t27, which sha'lit is iourmtled in the side walls ot the top cap 11 and carries at one ot its ends outside said top cap a weightarm 28, upon which a weight 29 may be adjustably secured.

l/Vhen the. valve hereinbelore described is to be used in a non-condensing system, the valve 17 is opened. ,lhe pressurein the inlet side ot' thc valve-casing tends to litt the valve 22 llrom its seat 7. Such openingl movement is resisted by the weighted arm 28, the stearnpressure upon the upper side of the piston 23, and the piston 21. in the dash-pot cylinder 12. lt the operator from an excess of caution or for other reasons should place upon the arm 28 weights which were barely suiiicient to maintain the desired back pressure, the treu quent slight variations o1 pressure in the snpvplymain are likely to cause chattering of the valve. Such underweighting may be corrected by partially closing the valve 17 in order to increase the pressure upon the under side ot' the piston 23, and thus hold the valve 22 slightly open all the time.

ll the valve is to be used in a condensing system, the valve 17 is closed and the weights removed from the arm 28. The cylinders 12 and 15, with their pistons, act as dashpots to check the movements ol the valve 15. ln practice condensation collects in the cylinder 15, and when the piston 23 is raised in the opening movement ot the valve-closure 22 the coudensation Hows into the space beneath said piston, where its presence retards the closing of the closure 22, thus preventingchattering.

The vertical pattern o'l the valve, as shown in Fig. 2, is sulgistantially like the horizontal iorm. The valve-casing in this instance is shown as formed in two parts 30 and 31, secured together by means of iianges 32 and provided, respectively, with an inlet-opening 33 and an outlet-opening 34. A partition 35 extends across the top of the casing-section 30, said partition having an opening therein for receiving the valve-seat ring 36. Cylinders 37 and 38 are supported within the valvecasing by means of arms 39. rI`he cylinder 37 is connected with the atmosphere by means of a duct 40, formed partly in the valve-casing and partly in one of' the arms 39. 41 is a valve for opening and closing communication between said cylinder 37 and the atmosphere, said valve being arranged to be seated upon a valve-seat 41 and its stem extending through a stuffing-box 43. A pipe 44, extending into the easing, is provided for admitting water to form a water seal. A piston 45 for the cylinder 37, a valve 46 for the valve-seat 36, and a piston 47 for the cylinder 38 are rigidly secured upon a valve-stem 48. This piston fits its cylinder loosely, like the piston 23 in the horizontal valve. An arm 49, fixed upon a shaft 50, rotatably mounted in the opposite walls of the valve-casing section 31, has a sliding connection with said valve-stem. Upon one end of the shaft 50, outside oi' the valvecasing, is fixed a weight-lever 51, upon which a weight 52 may be adjustably mounted. A drip-pipe 53 prevents the accumulation of an excessive amount of water above the valve 46. 54 is a hand-hole in the side of the valve-casing, arranged to be closed in any suitable manner. The operation of' the form of valvejust described is the same as that of' the horizontal valve shown in Fig. 1.

When it is desired to maintain high back pressure, means may be provided for admitting steam-pressure to the Lipper side of the piston 21 47 to assist in holding the valve 22 46 closed. The connection between the cylinder 12 38 and the inlet side of the valve-casing may be established through a passage in the walls of the casing by means of an opening` extending' longitudinally through the valvestem 20 48, or. as shown in Fig. 2, by means of a pipe 55, controlled by a valve 56.

I desire to have it understood thatI do not limit myself to the precise details shown herein, as many changes may be made by those skilled in the art without departing from the spirit and scope of my invention.

I claim as my invention-- 1. In a valve, in combination, a valve-casing having an inlet andan outlet; avalve-seat within said valve-casing; two alined cylinders at opposite sides of' said valve-casing', a valvestem; a closure on said stem for said valveseat; a piston on said valve-stem i'or each of said cylinders said pistons and cylinders being adapted to act as dash-pots for checking the movements of said closure; and means tending to hold said closure seated.

2. In a valve, in combination, a valve-casing having an inlet and an outlet; a valve-seat within said valve-casing; two alinedl cylinders at opposite sides of saidl valve-casing; a valvestem; a closure on said stem for said valveseat; a piston on said valve-stem for each of said cylinders said pistons and cylinders being adapted to act as dash-pots for checking the movements of' said closure; an operatingshaft; an arm on said shaft for moving said valve-stem; a weight-arm on said shaft; and a removable weight on said arm.

3. In a valve, in combination, a valve-casing having an inlet and an outlet; a valve-seat within said valve-casing; a cylinder; a valvestem; a closure on said stem for said valveseat; a piston in said valve-stem for said cylinder adapted to permit the passage of pressure past it, means of communication being provided between said cylinder and the atmosphere; and means for controlling saidcommunication.

4. In a valve, in combination, a valve-casing having an inlet and an outlet; a partition in said casing having a valve-opening therein;

a cylinder communicating with the inlet sidel of said partition; a valve-stem; a closure on said valve-stem for said valve-opening; a piston on said valve-stem for saidcylinder adapted to permit the passage of pressure past it, means of' communication being provided-between said cylinder and the atmosphere; andv means for controlling said communication 5. In a valve, in combination', a valve-casing having an inlet and an outlet; a valve-seat within said valve-casing; a cylinder havlng an open upper end communicating with the 1nlct side of said casing, Wherebycondensation is permitted to collect in said cylinder; a

valve-stem; a closure onY said stem for said:

valve-seat; and a piston on said valve-stem fitting said cylinder loosely.

6. In a valve, in combination, a valve-casing having an inlet and an outlet; avalve-seat within said valve-casing; two alined cylinders at opposite sides of said valve-casing; a valvestem; a closure on said stem for said valveseat; a piston on said valve-stem-for each of' said cylinders one of' said pistons fitting its WILLIAM HOCHFELDT.

Vitnesses:

L. L. MILLER, GEORGE L. OHINDAHL.

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